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MELSEC-A

5   PRELIMINARY INFORMATION

(4)   Program

Refer to section 5.7.4 for details on writing the data using the
transmission/reception buffer.
Refer to section 5.1 for details on the program conditions.

Master station initialization (parameter setting, data link setting) (Refer to section 5.4.)

Write initialization data to R2 (Refer to section 5.7.4.)

R2 normal

Set initialization data
 write complete flag

Set initialization request 
(RYn4)

Reset initialization request 
(RYn4)

Initialization complete

Writing to R2 completed

Reading of remote input (RX) (Refer to section 5.3 (2).)

Confirmation of R2 data link status (Refer to section 5.3 (3).)

Transmission of data to external device (Refer to section 6.4.1.)

Receiption of data from external device (Refer to section 6.4.2.)

R2 error processing (Refer to section 5.3 (7).)

Writing of remote output (RY) (Refer to section 5.3 (8).)

Set the error 
occurrence flag

POINT

Create the following interlock circuit so that the initialization request is made after all
request signals (RY) are turned OFF.

SET  (RYn4)

Error reset 
request 
(RY(n+1)A)

Initialization 
command

Transmis-
sion request 
(RYn0)

Transmis-
sion cancel
request
(RYn1)

Reception 
read output 
complete 
(RYn2)

Forced 
reception 
complete 
request 
(RYn3)

OS 
reception
buffer clear
request
(RYn6)

EEPROM 
function 
request 
(RYn7)

Initialization
request 
(RY(n+1)9)

If initialization is carried out while RX or RY is ON, the current process will be canceled.
Start initialization after turning all RY, other than RYn4, OFF.